| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how [pers pn] happen [conj] | 7 |
|
| 2 | how it happen [conj] | 7 |
|
| 3 | how [pron] happened [conj] | 7 |
|
| 4 | how it happen [conj] | 7 |
|
| 5 | how [pron] happen [coord] | 7 |
|
